Just a suggestion, post the sections that are new somewhere so they can recieve closer attention. Maybe a table or something. The older a paragraph is, the more likely it has been thoughly reviewed.

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I notice all sections in chapters 3 and 7 are tagged for proofreading - I'm not sure whether this is because there have been small changes across all sections or whether they have all been tagged so that the chapters in questions can be proofread in full for the purposes of consistency.

I notice all sections in chapters 3 and 7 are tagged for proofreading - I'm not sure whether this is because there have been small changes across all sections or whether they have all been tagged so that the chapters in questions can be proofread in full for the purposes of consistency.

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Chapter 3 has approximately doubled in size.
Chapter 7 only has a new unijunction transistor section to complet it.

Both chapters have had captions (and links to the captions) added to the images. Pay attention to captions. The Linux program "diction" was used to point out suspicious grammer. This results in minor changes throught the text. These activities can introduce errors into the text.